Union Pacific and Progress Rail Services are preparing to test a low-emission intermediate-haul locomotive at the Southwest Research Institute in San Antonio, Tex. Testing, which the companies claim is a first for intermediate-haul locomotives, is scheduled to begin later this month.
A Union Pacific SD40-2 locomotive, originally built in the 1970s, has been repowered with a 3,005-hp Caterpillar low-emission, clean-diesel engine, model 3516C-HD, designed to surpass EPA Tier 2 locomotive emissions requirements. The engine incorporates advanced emission control technologies that have been tested successfully in a laboratory setting and will be tested for service on intermediate-haul routes.
UP and Progress Rail Services say the engine initially will be field-tested in a controlled local application to closely monitor its performance and durability over the testing period.